-52.86% is the change from 210 to 99
Calculation steps:
[( 99 - 210 ) ÷ 210] x 100 = -52.86%
Formula
Percentage change = [(99 - 210) / 210] x 100
Subtract the new number by the original number
99 - 210 = -111
-111 ÷ 210 = -0.5285714285714286
-0.5285714285714286 x 100 = -52.86%